Because most wine is blended from multiple tanks and barrels, these barrels may have been treated separately, and with different fining agents. Technically those agents may remain in the wine, but only in extremely low levels, parts per million. The Vegan wine scene is very small, and because of the nature of winemaking, those “Vegan” wines typically come from extremely small lots, where this can be certified from start to finish.

Most of the Kirkland Signature wines will not meet that criteria and very few branded wines on the shelf anywhere in the world will.

For instance: The Kirkland Signature Napa Chardonnay 2011 and 2012 used
Gelatin, Casein and Milk as fining agents."